Bluetooth Dongle ES-388 Wireless USB Bluetooth 2.0 Adapter Go wireless! This Bluetooth ES-388 Class 1 USB 2.0 Adapter operates at 2.4 GHz frequency and is Bluetooth Ver. 1.1, 1.2, 2.0 compliant! Features: Bluetooth Ver. 1.1, 1.2, 2.0 compliant USB 2.0 interface (USB 1.1 compliant) range (20 meters) Compact and portable USB bus powered Specifications: Model: ES-388 Frequency: 2.4 - 2.48 GHz Number of channels: 79 channels Modulation: FHSS/GFSK 1 Mbps 1600hop/s Transmission power: 0dm (BT TX power class 2) Receiving sensitivity: Better than -75 dBm @ 0.1% BER Power Consumption: 130 mA (max) Protocol: BT host controller, L2CAP, SDP, RFCOMM Dimensions : 2 x 0.5 x 0.25-inches (H x W x D, approximate) Support : Windows ME/2000/XP/vista/Win 7/Win 8